<?php
/**
 *
 * @authors  Ysg (y.shi.guo@gmail.com)
 * @website  http://ysg.bonza.cn
 * @date     2017-08-08 09:14:07
 */

//验证码类
class ValidateCode
{
	 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
	 private $code;//验证码
	 private $codelen = 4;//验证码长度
	 private $width = 130;//宽度
	 private $height = 50;//高度
	 private $img;//图形资源句柄
	 private $font;//指定的字体
	 private $fontsize = 20;//指定字体大小
	 private $fontcolor;//指定字体颜色
	 //构造方法初始化
	 public function __construct($codelen = 4,$width = 130,$height = 50,$fontsize=20) {
	 	$this->codelen  = $codelen;
	 	$this->width = $width;
	 	$this->height = $height;
	 	$this->fontsize = $fontsize;
		$this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字体路径要写对，否则显示不了图片
	 }
	 //生成随机码
	private function createCode() {
		$_len = strlen($this->charset)-1;
		for ($i=0;$i<$this->codelen;$i++) {
			$this->code .= $this->charset[mt_rand(0,$_len)];
		}
	}
	 //生成背景
	private function createBg() {
		$this->img = imagecreatetruecolor($this->width, $this->height);
		$color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
		// imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
		imagefilledrectangle($this->img,0,0,$this->width,$this->height,$color);
	}
	 //生成文字
	private function createFont() {
		$_x = $this->width / $this->codelen;
		for ($i=0;$i<$this->codelen;$i++) {
			$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
			imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height/1.4,$this->fontcolor,$this->font,$this->code[$i]);
		}
	}
	 //生成线条、雪花
	private function createLine() {
	  //线条
		for ($i=0;$i<6;$i++) {
			$color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
			imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
		}
	  //雪花
		for ($i=0;$i<100;$i++) {
			$color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
			imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
		}
	}
	 //输出
	private function outPut() {
		header('Content-type:image/png');
		imagepng($this->img);
		imagedestroy($this->img);
	}
	 //对外生成
	public function doimg() {
		$this->createBg();
		$this->createCode();
		$this->createLine();
		$this->createFont();
		$this->outPut();
	}
	 //获取验证码
	public function getCode() {
		return strtolower($this->code);
	}
}
